<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			.bigFont{
				font-size: 50px;
			}
			.redColor{
				color: red;
			}
			.underline{
				text-decoration: underline;
			}
		</style>
	</head>

	<body>
		<p class="bigFont redColor">段落1</p>
		<p class="redColor">段落11</p>
		<p class="underline redColor">段落2</p>
		<p class="bigFont underline">段落3</p>
		<p class="bigFont underline redColor">段落4</p>
	</body>

</html>